A thin organic light emitting device that can be used in thin devices like mobile phones and personal digital assistants. An organic light emitting display (OLED) includes a layer that blocks UV rays so that the diode and the transistor are shielded from UV rays during and after production. In order to prevent breakage during production, two substrates are bonded together and the devices are formed on each of the two substrates, providing a thicker structure that is less apt to break. The substrates are separated after production is complete.